Developments in the use of high resolution point cloud data to inform heritage restoration

Abstract

While considered an emerging technology at the time of the Canterbury Earthquakes, extensive use of laser scanning derived point cloud data over the last 10 years has resulted in refined processes with new and existing applications to harness the power of this high-resolution data. All heritage restoration projects come with the guarantee of unexpected coordination challenges related to the existing building fabric. The use of point cloud data enables an increased understanding of the existing building condition, which aids in the planning, design and construction phases of the project. Whether it be coordinating spatial requirements for specialised rooms between out-of-plumb walls or using laser scans to provide a true and accurate record of damaged elements, point cloud data and heritage restoration now go hand in hand. The high-resolution data that is captured provides the ability to fully document all building elements with increased accuracy without the risks and challenges associated in gaining access to areas for a site measure – particularly areas at height. In badly damaged buildings, laser scanning is used to measure aspects such as the offset of damaged stonework from a distance without needing to expose people to the hazards present. The use of the high-resolution imagery in damage reports and documentation enables better informed decisions for practical stabilisation solutions to be made and clearer communication to contractors. In this paper we will explore examples of how point clouds have been utilised effectively, to accurately coordinate the design with the condition of existing structure.